“Climate change is a quintessentially global challenge, and addressing it will require an all-hands-on-deck effort – one that transcends borders, sectors and levels of government. This is something many of the world’s mayors understand instinctively – which is good news because, with roughly 5.2 billion people projected to live in urban communities by 2050, how the world’s cities confront climate change will make all the difference.” – United States Secretary of State John Kerry

“Cities are leading the charge against climate change, and one of the reasons is that they share so much in common – what works for one city usually holds valuable lessons for many others. The more we help city leaders collaborate and share their wisdom, the faster they can make progress.” - U.N. Secretary-General’s Special Envoy for Cities and Climate Change and former New York City Mayor Michael R. Bloomberg


Our Cities, Our Climate: A Bloomberg Philanthropies - U.S. Department of State Partnership leverages the leading role cities play internationally in advancing innovative climate change action.

The partnership convenes an international conversation for mayors around the world. This exchange will also bring together international city sustainability officials, U.S. officials, and U.S. organizations to share best practices, discuss solutions, and ultimately accelerate the progress the world’s cities are making to address this global challenge.

Our Cities, Our Climate aims to:

  • Strengthen networks between international and U.S. cities;
  • Showcase cutting-edge U.S. climate change efforts;
  • Encourage the implementation of climate change-related best practices at the subnational level and in partnership with national governments; and
  • Reinforce climate-action momentum in the final weeks before December’s UNFCCC Conference of the Parties in Paris (COP21).
  • 2015 Events

    As part of Our Cities, Our Climate, urban sustainability directors from cities around the world and leaders who are committed to climate change action will spend 10 days in the United States from September 30-October 9. Through visits to San Francisco, Boston, and finally Washington, D.C. as part of the International Visitor Leadership Program, participants will interact with U.S. leaders in the sustainability field, focusing on such issues as solid waste strategy, transforming energy supplies, and building efficiency.

    Meetings and sessions from October 7-9 in Washington, D.C., will allow participants to discuss shared challenges, examine innovative practices, and create connections with global climate change leaders. It will provide participants an opportunity to form robust partnerships for future collaboration.

    At the culmination of this historic initiative, U.S. Secretary of State John F. Kerry and Michael R. Bloomberg, U.N. Secretary-General’s Special Envoy for Cities and Climate Change, will gather mayors in Washington, D.C. for two days of site visits, working sessions, and a luncheon at the State Department. International and U.S. mayors will be honored guests at the luncheon and participate in a mayoral discussion and meetings with senior U.S. government officials.